JPH03117504A - Tool partial coupling device - Google Patents

Abstract

PURPOSE: To surely connect a holder and a head to each other by accommodating an extensible link in a recessed part formed along the hole periphery of a holder, reducing the link in the radial direction by bolt actuation, and pressing the inclined surface of a tool hand pin with the inclined surface of the link inner surface. CONSTITUTION: An open-ended extensible link 16 is accommodated in a recess part 32 of a hole of a tool holder 14, one end is fixed by a screw 46, and the other end opening 44 is connected to a sliding body 48. The sliding body 48 is slid in the tangential direction by screw-in of a bolt 50, so that the link 16 is reduced in diameter in the radial direction. The inner peripheral sectional form of the link 16 is conical, and pressed to a conical annular shoulder 40 of a pin 18 of a tool head 10. Accordingly, the radial reduction in diameter of the ring 16 is converted to the axial movement of the pin 18 so that the annular contact surfaces 30, 20 between the holder 14 and the head 10 are firmly fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for connecting two tool parts of a machine tool, namely a tool head and a tool holder, the device being a device for connecting two tool parts of a machine tool, namely a tool head and a tool holder. a mounting pin provided in the tool section and surrounded by an annular surface extending perpendicular to the pin; a mating hole provided in the other tool section for receiving the mounting pin and surrounded by an annular end surface; a recess provided therein and a support 1 placed in the recess for at least partial radial movement (elongated so as to draw the annular surfaces of the tool parts tightly together during actuation of the device and the actuating device); A contact device is provided at the pin which cooperates with the tensioning device to convert the radial movement of the device into axial movement of the pin.

PRIOR ART A device of this kind is known from GB 2212745. Two radially aligned internal threads are provided, each forming a recess. An extension device is located within the internal thread. Consists of radially cut threads.

The screw presses radially against a radial bolt located in a lateral hole in the pin. The end of the pole is wedge-shaped and converts the radial movement of the screw into axial movement of the pin.

Another device for joining two tool parts is described in European Patent No. 31
As known from No. 0942AL, an axial extension bar is used which presses the extension ball radially outwards into a recess in a tool holder that connects the tool head.

Known re-devices have the same disadvantage that the tensioning device requires space inside the pin of one tool part, and for this reason the axial coupling extending through the coupling device, For example, it is not possible to install coolant and hydraulic pipes, electrical wiring, mechanical rods and lever devices.

Another disadvantage is that the device for converting radial forces into axial extension strokes has only a small wedge surface area of small dimensions, which is subject to high tension and due to y↑wear. Coupling devices have a limited operating life.

The main object of the invention is therefore to join two tool parts, namely a tool head and a tool holder, in a form-fitting manner without requiring any space inside the tool part, so that the drawing tool part has a hollow body. The objective is to obtain a coupling device that can be designed as follows.

Another object of the invention is to obtain a novel stretching device,
With this device the pins of one tool part are bonded more uniformly and positively and the stresses are distributed around its periphery.

Yet another object of the invention is to provide a coupling device which eliminates any radial distortion of the tool parts during actuation of the actuating device.

The last and most important object of the invention is to obtain a high axial clamping force distributed almost uniformly around the periphery of the tool part.
The object is to obtain a coupling device with an actuating device that requires only small actuating forces.

SUMMARY OF THE INVENTION The present invention therefore relates to the known coupling device described at the outset by providing an open end in which the recess extends along the periphery of the hole and the tensioning device is guided within the recess. a steel ring device having a circumferential intermediate space between its ends each engaging a contact body, an actuating device engaging at least one of said contact bodies to change said circumferential hollow space; and reducing the diameter of the ring device and moving the ring device at least partially inward to protrude radially into the bore, the contact device of the pin being an annular member provided near the front end of the pin. the ring device having at least one annular clamping surface on one side thereof cooperating with the annular shoulder of the pin, and the at least one annular support surface on the opposite side having an annular support surface of the recess; Supporting laterally, the ring device is distinguished by the fact that it forms an annularly extending form-fitting coupling device between the two tool parts.

(Function) It is known per se that clamps that can act tangentially to obtain a radial clamping force, for example for clamping a water hose onto a fitting, use a tensioning device in the form of a ring. , the invention uses a lick ring device that positively connects two tool parts in the axial direction in a form-fitting manner, whereby the ring device simultaneously positively connects the drawing tool parts, in particular the tool holder and the tool head. engage with.

A ring device according to one embodiment of the present invention has a two-piece open-ended spring steel ring member. According to another embodiment of the invention, the ring device consists of two or more annularly extending sections each attached at adjacent ends to simplify assembly within the peripheral recess.

EXAMPLE According to FIG. 1, a tool head 10 carrying a tool 12 at its front end is coupled to a tool holder 14 by an open-ended extension ring 16 provided in a recess 32 in a hole in the tool holder. . The tool head 10 has a mounting pin 18 surrounded by an annular surface 20 extending at right angles to an axis 22 of the pin 18 .

An axial cylindrical groove 24 extends the length of the tool holder 14, the front end of which is formed as a mating hole 28 for receiving and centering the pin 18.

Tool head 10 has an axial passage 26. In the coupling position, the annular end surface 30 of the tool holder 14 is in contact with the annular surface 20 of the tool head 10.

An annular recess 32 opening into the bore 28 is provided near the front end of the tool holder 14 . The expansion ring 16 is inserted into the recess 32 so that it can move radially, but is retained so that it cannot move axially. The ring 16 has an annular clamping surface 34 associated with the rear side and an annular support surface 36, the support surface being formed by the front side of the ring 16. Tightening surface 34
are biased inwardly with respect to the support surface 36.

The pin 18 of the tool head 10 is provided with a circumferential groove 38 that is generally axially aligned with the ring 16. An annular shoulder 40 extends from the bottom of groove 38 to the outer periphery of pin 18.

The ring 16 is constructed of spring steel and, in its undeformed, uncoupled position, substantially fills the recess 32 and projects at most slightly inside the bore 28 .

According to FIG. 4, both ends of the ring 14 have openings 42,44. A screw 46 is threaded into the tool holder 14 and projects into the opening 42 to hold the ring in place. The slide 48 is similarly connected to the opening 44 in the outer ring end. The slide 48 has an internal thread into which a screw 50 is threaded and can be actuated from outside the tool holder to pull the slide 48 to the left in FIG. The distance in the peripheral direction is reduced by 6 cylinders. The diameter of the ring is therefore reduced by 2 mm. During this diameter reduction, the tightening of the ring 16 causes the surface 34 to come into contact with the annular shoulder 40 of the pin 18, and since this shoulder according to 1 in FIG. 2 is conical, the radial movement of the ring 16 is
This translates into an axial movement of the pin 18 with respect to the tool holder 14. In order to tighten the annular surfaces 20.30 of the tool parts 10.14 together, only a slight axial movement, for example 1/2 inch, is sufficient.

If the annular shoulder 40 is designed to form a convex line in longitudinal section instead of the straight line shown in FIG. .

According to FIG. 3, the sides of the recess 32, viewed in longitudinal section, slope backwards, which means that both sides are conical. At least the support surface 36 of the ring 16 has a correspondingly shaped conical surface. Therefore, any radial movement of ring 16 results in its axial movement. The annular shoulder 40 in this embodiment lies in a radial plane, and the same is true for the clamping surface 34.

The embodiment of FIG. 7 differs from that of FIG. 4 in that it is provided with a screw 52 which, like the screw 50 of FIG. 4, acts approximately tangentially on the ring 16. , screw 52
is screwed into the internal thread 54 of the tool holder 14, and the ball portion 58 pushes the ring 16 toward the sliding body 48.
Different to reduce the diameter of. Mounting bolt 56 holds screw 52 in its coupled position.

In FIGS. 5 and 6, another actuating device is shown which, compared to the one described above, primarily requires an increase in the intermediate space between the ends of the ring 16 to reduce its diameter;
The difference is that both ends of the ring 16 move at the same time. One end of the ring 16 has a longitudinally extending central groove 60 into which the tongue 62 of the other ring end engages. The ends of ring 16 thereby overlap in the circumferential direction. One contact body 64 is welded to one ring end of the bifurcated ring, and the other contact body 66
is welded onto the tongue end of the other ring end. The eccentric plate 68 is mounted for rotation within the tool holder 14 between the projectors 64, 66. Through the hole in the tool holder, the key 70 is connected to the eccentric plate 68, which can be rotated to force the projectors away from each other. A rotation of about 90° is sufficient without bringing the ring 16 into its coupled position.

The drawing has a tool head with a mounting pin, a recess and an extension ring inserted therein. Although shown as a tool holder with a mating hole, the apparatus can be reversed to provide a pin on the tool boulder and a mating hole with an extension ring in the tool head.

[Brief explanation of drawings]

1 is a side view of a tool head coupled to a tool holder by a circumferentially tensioned coupling device; FIG. 2 is an enlarged view of the device laterally inverted with respect to FIG. 1; and FIG. Similar drawings, but showing a second embodiment of the tensioning ring in the coupled position, FIG. 4 a sectional view of the tool holder accommodating the tensioning ring, and FIG. 6 is a longitudinal sectional view taken along line 6--6 of FIG. 5, and FIG. 7 is a sectional view of a third embodiment of the actuating device.

Claims (10)

[Claims] (1) A device for coupling a tool head and a tool holder of a machine tool, the mounting pin being provided on one tool part and surrounded by an annular surface extending at right angles to the mounting pin;
a mating hole provided in the other tool part for receiving said mounting pin and surrounded by an annular end surface; a recess provided in said hole of said other tool part; a tensioning device placed in said recess for movement in a direction and converting radial movement of said tensioning device into axial movement of said pin in order to draw tightly together the annular surfaces of said tool part upon actuation of said actuating device; a contact device provided on the pin that cooperates with the tensioning device to a steel ring device, the circumferential intermediate spaces between the ends thereof being respectively engaged by contact bodies, the actuating device changing the circumferential intermediate space thereof and reducing the diameter of the ring device; , and engaging at least one of the contact bodies to at least partially transition the ring device to project radially into the hole, the contact device of the pin proximate the forward end of the pin; an annular shoulder provided, said ring device having on one side thereof at least one annular clamping surface cooperating with said annular shoulder of said pin, and at least one annular support surface on the opposite side said concave shoulder; Tool part coupling device, characterized in that, supported towards an annular side of the tool part, said ring device forms a form-fitting coupling device extending annularly between said two tool parts. (2) In the tool partial coupling device according to claim 1, the annular shoulder of the pin is arranged radially from the outer periphery of the pin end in its axial cross section along a line forming a shape with a straight mid-height line. a tool portion coupling device extending to an axially spaced inner edge biased inwardly; 3. The tool part coupling device of claim 1, wherein said ring device comprises a one-piece spring steel ring member. 4. The tool part coupling device of claim 1, wherein the direction of the force applied by said actuating device to at least one contact member of said ring arrangement is substantially tangential with respect to said ring arrangement. (5) The tool part coupling device according to claim 1, wherein the ring device has at least one ring member, the end of which is provided with an opening, and the contact bodies are respectively arranged in the recesses. a tool part consisting of a separate member placed in a cavity recessed in the opening of said other tool part which opens, said contact body positively engaging said opening in said ring member; Coupling device. (6) The tool part coupling device according to claim 1, wherein the actuating device has a screw located in a radial plane that intersects with and is substantially tangential to the ring device; A tool part coupling device forming a threaded connection with one of the members constituted by the other tool part and at least one of the contact bodies. 7. The tool section coupling device of claim 1, wherein said ring device includes a spring steel ring member extending circumferentially over 360° and having overlapping ends, and said actuating device is configured to connect said ring member with A tool part joining device having a pressing device for enlarging the intermediate space between the pair of contact bodies of the ring member when the diameter is reduced. (8) The tool part coupling device according to claim 1, wherein the actuating device has an eccentric plate mounted to rotate within the one tool part, and the rotating surface of the eccentric plate is arranged with respect to the ring device. A tool part coupling device that is approximately tangential. 9. The tool section coupling device of claim 1, wherein said ring device includes a spring steel strip guiding a plurality of circumferentially disposed separate tension members, each of which is attached to an annular shoulder of said pin. a tool part coupling device that engages with the tool part coupling device; 10. The tool portion coupling device of claim 1, wherein said ring device includes an integral spring steel ring member, and said actuation device engages contact bodies at opposite ends of said ring member.